[pure-silver] Re: AZO and Benzotriazole for anti-fogging
- From: "Michael A. Smith and Paula Chamlee" <michaelandpaula@xxxxxxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 20 May 2009 18:53:16 -0400
Hello Bogdan,
This is the first mention of Azo since I have
been back on this list, so I will chime in.
There will be no fogging on the Azo. If you have
read my articles on Azo (all at
http://www.michaleandpaula.com) you will see that
Azo that has been stored in hot conditions has
been perfect after thirty years. We now print on
Azo from the 1970s (and occasionally Azo from the
1940s). It is fine, except that it has lost a
little contrast.
I do not recommend Benzotriazole at all. It
causes an ugly blue color. use KBr instead. Also,
Dektol gives an unpleasant tone as well. Amidol
gives the finest results. The formula I recommend
is in my articles. Today, I add 50% more KBr, but
otherwise, the formula works best as printed.
Feel free to ask any questions.
Michael A. Smith
Hello,
I want to do some contact printing using AZO
paper that has been kept in a fridge for the
past ten years. I'll be using it for the first
time tomorrow. If there is fogging, how much
benzotriazole should I add per liter of Dektol
1:2. The "Darkroom Cookbook" says that
Benzotriazole does not dissolve readily in cold
water. It says to dissolve in hot water ...
125°F/51.67°C or higher. Should I heat up the
water before diluting the Dektol or can the
Dektol dilute solution be heated up and then
adding the Benzotriazole?
Any and all recommendations are welcome.
Cheers,
Bogdan
--
________________________________________________________________
Bogdan Karasek
Montréal, Québec bogdan(at)bogdanphoto.com
Canada www.bogdanphoto.com
"I bear witness"
________________________________________________________________
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